8221551228 has 36 divisors (see below), whose sum is σ = 22671551448. Its totient is φ = 2491379040.

The previous prime is 8221551211. The next prime is 8221551229.

8221551228 is a `hidden beast` number, since 82 + 2 + 1 + 551 + 2 + 28 = 666.

8221551228 is nontrivially palindromic in base 10.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 8221551192 and 8221551201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8221551229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10380351 + ... + 10381142.

It is an arithmetic number, because the mean of its divisors is an integer number (629765318).

Almost surely, 2^8221551228 is an apocalyptic number.

It is an amenable number.

8221551228 is an abundant number, since it is smaller than the sum of its proper divisors (14450000220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8221551228 is a wasteful number, since it uses less digits than its factorization.

8221551228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20761514 (or 20761509 counting only the distinct ones).

The product of its digits is 25600, while the sum is 36.

The square root of 8221551228 is about 90672.7700470213. The cubic root of 8221551228 is about 2018.2947432508.

The spelling of 8221551228 in words is "eight billion, two hundred twenty-one million, five hundred fifty-one thousand, two hundred twenty-eight".